#include <stdio.h>
   #define LOWER  0     /* lower limit of table */
   #define UPPER  300   /* upper limit */
   #define STEP   20    /* step size */
   /* print Fahrenheit-Celsius table */
   main()
   {
       int fahr;
       for (fahr = LOWER; fahr <= UPPER; fahr = fahr + STEP)
           printf("%3d %6.1f\n", fahr, (5.0/9.0)*(fahr-32));
   }